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what would be the right purpose of air box resonator? some say he quiets the air flow on low rpms and should be there, others say it is better to remove it because car than has better sound etc...
 

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You could try it without. On my last car I removed it and although it made more noise I definitely lost torque low down so I put it back on again!
 

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I removed the resonator in my last 145. Didnt notice a decrease in torque (thats not to say there want a decrease). I did notice an increase in intake roar though - got to be worth it for that alone in my opinion!
 

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I don't think it would make much difference on a TB, although it could help smooth out the airflow going into the turbo.

On a normally aspirated car the resonators help improve mid-range torque.
 
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